Part museum, part piece of Arthurian-inspired history, this stately hall attracts King Arthur fans from miles away.

A fantastic castle rumored to be the birthplace of King Arthur.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

World's largest working waterwheel has been around for over 150 years.

This roadside attraction looks like a flying saucer parked atop the tundra.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

World's strongest whirlpool.

According to the locals, the sands of this secluded Norway beach are infused with gemstone particles.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Norway has built what may be the world's most beautiful public toilet.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

Walk behind a 50-meter-high waterfall.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

20kV overhead line with a garland-like cable.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

The walls and streets of the ancient city are peppered with penises.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Go inside to really appreciate this 500-year-old technological masterpiece.